The clearest signs you need to rekey your home’s locks are simple: someone who shouldn’t have a key might still have one. That covers a new home purchase, lost or stolen keys, a departed roommate, or a recent break-in. Rekeying costs about $140 on average nationally per Yelp’s 2026 cost data – a fraction of full lock replacement. Here are the 10 situations where rekeying is the smart move, and how urgent each one really is.
You’ll also like to read this: How Much Should it Cost to Rekey a House in Boca Raton
What rekeying actually does (and why it beats replacing)
Rekeying swaps the small pins inside your existing lock cylinder so every old key stops working. The lock body, deadbolt, and hardware stay exactly where they are – only the key changes.
That’s why it’s cheap and fast. A professional rekey takes 10–15 minutes per lock, while full replacement can run 3–5 times the cost. Unless your hardware is damaged or you want a smart-lock upgrade, rekeying delivers identical security for less money.
10 signs you need to rekey your home’s locks
Each sign below includes the risk level, so you know whether to book a locksmith today or add it to this month’s to-do list.
1. You just moved to a new home
This is the single most important rekeying trigger – and the most skipped. The previous owner’s family, their contractors, cleaners, dog walkers, and real estate agents may all hold working copies of your key. You have no way to count them.
Risk level: High. Rekey within 48 hours of getting your keys, before you move valuables in. Many locksmiths offer new-homeowner bundles that rekey every exterior door in one visit.
2. You lost your keys
A lost key is a live key. If it was attached to anything identifying – a keychain with your name, a bag with mail inside – whoever finds it can find your door.
Risk level: High if the key is identifiable, moderate if not. Either way, rekeying is cheaper than gambling. If you’re also locked out, expect a combined lockout-plus-rekey service call of roughly $125–$200 during business hours, per Yelp’s locksmith cost guide.
3. Your keys were stolen
Stolen keys are worse than lost ones: someone deliberately took them, and often took your address at the same time (a stolen purse or wallet usually contains both). FBI data shows 37.8% of burglaries are “unlawful entries” – no forced entry at all, which is exactly what a working key enables.
Risk level: Urgent. Rekey the same day. Treat this like canceling a stolen credit card – every hour of delay is exposure.
4. A roommate or tenant moved out
Even amicable move-outs leave loose keys behind. Departing roommates and tenants often made copies you never saw – for partners, friends, or “just in case.” Landlords in many states are expected to re-secure units between tenancies, and rekeying is the standard, low-cost way to do it.
Risk level: Moderate to high. Rekey within a day or two of the move-out, especially if the departure was tense or rushed.
5. You experienced a break-in or security scare
After a burglary, rekeying isn’t optional – it’s step one of recovery. Intruders sometimes pocket spare keys from kitchen drawers or entry tables specifically so they can return without force. Research from the Center for Problem-Oriented Policing shows repeat burglary risk is highest in the first week after the initial break-in.
Risk level: Urgent. Rekey all exterior doors immediately, and have the locksmith inspect for cylinder damage while they’re there – a damaged lock may need replacement instead.
6. After a break-up or divorce
An ex-partner with a key has unrestricted access to your home, your belongings, and your peace of mind. Even if you trust them, you can’t trust every copy they may have made or lent out during the relationship.
Risk level: Situational – but err on the side of urgent. If the split involved conflict, rekey before they know you’ve done it. This is one of the most common same-day rekey requests locksmiths receive.
7. You changed contractors, housekeepers, or other service providers
Renovation crews, cleaning services, pet sitters, and property managers routinely hold keys for weeks or months. When the working relationship ends, the key often doesn’t come back – or a copy quietly stays behind with a subcontractor you never met.
Risk level: Moderate. Rekey at the end of any project where keys changed hands. Going forward, consider a lockbox or smart lock with temporary codes so future providers never touch a physical key.
8. You lent out a key and didn’t get it back
The neighbor who watered your plants in 2023. The friend who borrowed your place for a weekend. If you can’t produce every key you’ve ever handed out, your lock’s security is only as strong as your memory.
Risk level: Low to moderate – but it compounds. Do a quick key audit: if you can’t account for every copy, one rekey resets the count to zero.
9. You want one-key convenience for all locks
Not every rekeying reason is about threats. If your front door, back door, side door, and garage each use a different key, a locksmith can rekey them all to be “keyed alike” – one key opens everything.
Risk level: None – this is pure convenience. It typically adds only $5–$10 per additional lock, per BH Locksmith’s 2026 residential pricing guide, and it’s the cheapest quality-of-life upgrade in home security.
10. You haven’t changed your locks in years
Keys drift. Over a decade of normal life, copies accumulate with relatives, old sitters, and forgotten helpers. Meanwhile, builder-grade lock pins wear down, making the lock easier to manipulate and keys less reliable.
Risk level: Low, but rising every year. A rekey every 5–7 years – or after any of the events above – keeps key control in your hands and gives a locksmith a chance to spot worn hardware before it fails.
Rekey vs. replace: a 30-second decision guide
Your situation | Best option | Typical cost (2026) |
Locks work fine, keys are the risk | Rekey | ~$140 average per visit (Yelp) |
Lock is damaged, rusted, or 15+ years old | Replace | $200–$400 per door |
Want smart lock or keypad entry | Replace/upgrade | $150–$350+ per door |
Want one key for every door | Rekey (keyed alike) | +$5–$10 per extra lock |
The rule of thumb: if the hardware is healthy, rekey. If the hardware is the problem, replace.
Final thoughts
Every sign on this list comes down to one question: can you account for every copy of your key? If the answer is no – because of a move, a loss, a departure, or simply the passage of time – a $140 rekey buys back total key control.
The average burglary costs victims $2,661 in losses, per FBI figures. Against that number, rekeying a house is the cheapest insurance in home security. If two or more signs above apply to you, book a locksmith this week and have every exterior door done in a single visit.
Frequently Asked Questions
The national average is about $140 per locksmith visit, per Yelp’s 2026 cost data. Per-lock labor runs $20–$60 plus a service call fee of $50–$125. Bringing locks to a shop yourself drops the price to roughly $20 per cylinder.
Rekey when your hardware works fine and the risk is unaccounted-for keys – it delivers identical security at a fraction of the price. Replace only when the lock is damaged, badly worn, discontinued, or when you’re upgrading to a smart lock or higher-security cylinder.
Yes. A locksmith can pick the lock open and rekey it even if every key is lost, though it typically adds a small fee – around $10 extra – because the job takes longer. DIY rekey kits, by contrast, usually require the current working key.
A professional rekeys a standard residential lock in 10–15 minutes. A whole home with three to five exterior locks is usually finished within 30 to 60 minutes in a single visit, including cutting your new keys on site.
Yes – within the first 48 hours. Previous owners, their contractors, agents, and cleaners may all hold working copies you can’t count. Rekeying every exterior door on move-in day is the single highest-value security step for a new homeowner.
Rekeying restores key control – old keys stop working – but it doesn’t change the lock’s physical strength. If you want more resistance to forced entry, pair the rekey with a Grade 1 deadbolt and 3-inch strike-plate screws, which locksmiths can add during the same visit.
Or Ben Haim is a seasoned writer specializing in locksmithing and security solutions. With a passion for providing practical insights, Or creates engaging content that empowers readers to make informed decisions about their safety. His expertise ensures accurate, up-to-date information for homeowners, businesses, and vehicle owners alike.
